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看了文档都是如何如何使用，没搞明白为什么我要使用RN？
我在iOS端使用，能干什么？
三端通用，iOS写完粘贴复制Android和Web都能用？
搞不清楚，希望大神指点。
不同端UI不一样，业务逻辑基本一样。